kokoshnik. Typically made of wood, the bochka roof was extensively used both in the church and civilian architecture in the 17th and 18th centuries. Later it was sometimes used in Russian Revival style buildings. Gorodki Gorodki or townlets is an old Russian folk sport whose popularity has spread also to Scandinavia and the Baltic States. Similar to bowling, the aim of the game is to knock out groups of skittles arranged in some pattern by throwing a bat at them. The skittles, or pins, are called gorodki (literally little cities or townlets), and the square zone in which they are arranged is called the gorod (city). The game is mentioned in the old Russian chronicles and was known in the form close to the modern one at least from the 17th century, since one of the famous players in gorodki was the young Peter I of Russia. Roller coaster Russian Mountains were winter sled rides held on specially constructed hills of ice, sometimes up to 200 feet tall, being the first type of roller coaster. Known from the 17th century, the slides were built to a height of between 70 and 80 feet, consisted of a 50 degree drop, and were reinforced by wooden supports. In the 18th century they were especially popular in St. Petersburg and surrounding areas, from where by the late 18th century their usage and popularity spread to Europe. Sometimes wheeled carts were used instead of tracks, like in the Katalnaya Gorka built in Catherine II's residence in Oranienbaum. The first such wheeled ride was brought to Paris in 1804 under the name Les Montagnes Russes (French for "Russian Mountains"), and the term Russian Mountains continues to be a synonym for roller coaster in many countries today. Bird of Happiness The Bird of Happiness is the traditional North Russian wooden toy, carved in the shape of a bird. It was invented by Pomors, the inhabitants of the White and Barents Sea coastline. The Bird of Happiness is made without glue or other fasteners, by elaborate carving of thin petals for the bird's wings and tail and then using a special method of spreading and curving them. Similar methods are also used in other products of the North Russian handicraft. The amulet is usually made of pine, fir, spruce, or Siberian cedar. It is suspended inside a house, guarding the family hearth and well-being. Dymkovo toy Dymkovo